Analysis of rainfall variability and impact on the start and end dates of rainy seasons in the urban humid tropical zone: a case of the Yaoundé Town, Cameroon (Central Africa)

This study aims to evaluate the influence of current and changing rainfall dynamics on the start and end dates of the rainy seasons in Yaoundé town. Thus, classical statistical tests, trend detection, and break tests were applied for the analysis of different daily rainfall parameters recorded between 1964 and 2020. The results show that annual rainfall fluctuates between 1083 and 2196.7 mm for an interannual average of 1562 ± 271 mm without a significant break, with a downward trend of about − 3.352 mm/year. The increasing order of magnitude of seasonal precipitation is as follows: Small Dry Season